To start the installer, boot from the Amiga Forever CD, take a note of the version information that is displayed (KX Light 8.0 or higher), and enter the following command at the initial "boot:" prompt:

"af-fbtxt 2 screen=1024x768 depth=24"

"afinstall"

Skip the whole partitioning part if you don't want to format the entire harddrive !!!
Use the partition you created before.

The "vga=792" option allows you to set 1024x768 screenmodes on your Workbench.
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Copy the whole contents of the CD to a directory on your Amiga-HD (eg.: work.
Install over your Amigaforever-installation (full install).
Install the internet-apps too.
Install IDEfix97 (automatic) and then mount your OS3.9 CD under KX-light:
Ctrl-Alt-Backspace, Ctrl-Alt-F2, Ctrl-Alt-F1, Ctrl-C
"mount /dev/hdc" (example)
"startx"
Install the Boing-bags and the new locals.
Uninstall IDEfix97 but do not reboot.
Install the CDROM-driver from the OS3.9 installation directory.